[Bug 101245] Haswell ULT max. resolution regression in KMS [HSW] [i915]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101245

--- Comment #10 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Ville Syrjala from comment #9)
> (In reply to Michael Mounteney from comment #8)
> > > "Apparently HDMI->DVI dual mode adapter where we aren't able to infer the capabilities of the sink, and limit the clock rate to what we know works."
> > It did work up to 4.8.17.  I am using an Intel NUC with mini-HDMI to HDMI. 
> > No DVI-anything involved.
> 
> [    2.488338] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr:
> 0040 w(1)
> 
> Means there is no DP++ dongle involved.
> 
> [   11.111354] [drm:drm_add_edid_modes [drm]] HDMI: DVI dual 1, max TMDS
> clock 250000 kHz
> 
> This means the display itself is telling us that its max TMDS clock is lower
> than clock required by the 4k and 25x16 modes. The fact that it's saying
> dual link DVI and max TMDS clock > 165MHz in the same sentence is also a bit
> nonsensical since that exceeds the DVI spec, and dual link HDMI doesn't
> actually exist.

Thanks for the clarification, Ville. I quickly looked at the dmesg, and refused
to believe the display would do this. No idea why.

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